The official changelog for the February 2022 update is:
- Addresses scenarios outlined in the Android Security Bulletin – February 2022
- Improves system reliability and stability
- Improves device performance and animations
- Improves touch responsiveness
- Improves camera performance with autofocus
It went on smoothly to my own Duo 2 and the animations, in particular, in the Microsoft Launcher, are a nice touch, mimicking what you'd get in the iPhone and Samsung Galaxy phones.
Imaging results haven't changed, but I'm still waiting for my latest imaging comparison to be published here (see my note on server problems), so I won't do any more until everything's fixed up.
And here's Shane's long term review video:
You can also go read my own review of the Surface Duo 2. It's a special device(!)